JSON to TypeScript Converter
/json-to-typescriptGenerate TypeScript interfaces from any JSON object instantly. Perfect for API response typing.
Typing API responses by hand is the slowest part of frontend work. This converter generates TypeScript interfaces directly from any JSON sample. The output handles nested objects, arrays, and optional fields correctly. Generation is instant and happens entirely in your browser.
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FAQ
Frequently asked questions
Everything you need to know about json to typescript converter.
How are nested objects handled?
Nested objects and arrays become dedicated TypeScript interfaces with sensible generated names based on the property keys, so the whole shape of your API response is typed.
Can I control optional fields?
Yes. A toggle marks fields as optional when their JSON value is null, which is useful for nullable API responses where a property may be absent.
Which TypeScript output is produced?
The tool generates plain interface declarations rather than type aliases or zod schemas, and the output is ready to paste directly into a .ts file in your project.
Is my JSON sent to a server?
No. Interfaces are generated entirely in your browser, so response payloads with internal endpoint shapes never leave your device.
How are arrays typed?
Arrays are typed as arrays of the element interface, such as Item[], and arrays of primitives become number[] or string[] automatically based on the values present.
Can it handle empty objects?
Empty objects are typed as Record with string keys and unknown values, since there is no shape information to infer a more specific interface from.
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